"Position in the market"? Broadcom makes STB chips that trivially dwarf all the shipped Pis. Heck, the first Pi was based on a bunch of chips from an aborted project. The RPi folks are, unfortunately, lucky that Broadcom even gives them the time of day.

Not that I disagree with your overall statement -- certainly I've found myself explaining to folks in a commercial setting that while Raspberry Pi might be a great way to a quick prototype, you're going to need to reimplement against some other hardware. Really what you're getting with the R-Pi is the community that goes with it, who have so far been very loyal to that series of devices.